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pityriasis rosea

(rōsē-ə, -zē-ə)
n.
  1. A self-limited eruption of macules or papules involving principally the trunk and extremities.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.